1	Leaves 5- or 7(or 9)-foliolate, sometimes mixed with (1-)3-foliolate leaves		(2)
+	Leaves 3-foliolate, often 1-foliolate on upper part of stem		(3)
2 (1)	Leaflets linear to narrowly oblong, adaxially usually variegated on midvein, lateral veins looped with margin; pedicel 5-6 mm during anthesis, to 8 mm in fruit; lateral and lowest calyx lobes not elongate after anthesis, 2-3 mm; leaves (1-)3-foliolate on lower part of stem.		1 U. picta
+	Leaflets narrowly ovate to ovate, elliptic, or oblong, without variegated area, lateral veins extending to margin; pedicel 6-12 mm during anthesis, to 15 mm in fruit; lateral and lowest calyx lobes elongating to 5-6 mm after anthesis; leaves sometimes (1-)3-foliolate on upper part of stem.		2 U. crinita
3 (1)	Inflorescences usually terminal panicles, with dense glandular hairs 1-2 mm on inflorescence rachis, pedicels, and calyx; legume shortly pubescent.		5 U. lacei
+	Inflorescences usually simple, sometimes with elongate branches but not paniculate, glandular hairs present or absent on inflorescence rachis, pedicels, and calyx; legume glabrous or pubescent		(4)
4 (3)	Lateral and lowest calyx lobes more than 2 × as long as upper lobes; inflorescences usually 3-6 cm, densely flowered; bracts persistent, spreading at apex; leaflets usually orbicular to broadly ovate.		3 U. lagopodioides
+	Lateral and lowest calyx lobes less than 2 × as long as upper lobes; inflorescences usually longer than 6 cm, densely or loosely flowered; bracts deciduous or persistent, erect along inflorescence when persistent; leaflets oblong to ovate, rarely (in U. sinensis) broadly obovate or obcordate, apices truncate or emarginate		(5)
5 (4)	Inflorescence rachis, pedicels, and calyx with dense, spreading glandular hairs 1-2 mm; legume glabrous; inflorescences densely flowered; bracts 9-18 mm.		4 U. neglecta
+	Inflorescence rachis, pedicels, and calyx without or with sparse glandular hairs 1-2 mm; legume shortly hairy; inflorescences ± loosely flowered; bracts usually shorter than 13 mm		(6)
6 (5)	Apex of keel obtuse; pedicel 5-6 mm, recurved after anthesis; calyx lobes narrowly triangular, acuminate; legume minutely hairy; leaflets obtuse to acute or rarely rounded at apex.		6 U. rufescens
+	Apex of keel apiculate; pedicel to 13 mm, not recurved after anthesis; calyx lobes triangular to broadly ovate, acute; legume subglabrous with long glandular hairs; leaflets obtuse to truncate or emarginate at apex.		7 U. sinensis